It's about 150 times the number of Keys on a Piano.
In other words, the count of Keys on a Piano is 0.0067 times 13,000.(Moden layout; A0 to C7)
It's about 200 times the number of Submarines in the US Navy.
In other words, 13,000 is 180 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.0056 times that amount.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about 250 times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.0042 times 13,000.(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.
It's about 250 times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.0037 times 13,000.(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about 450 times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.0022 times 13,000.(a.k.a. EU) (2016 figures)
There are 28 member countries in the European Union, the latest member of which is Croatia. The EU is largely urban, with sixteen cities having a population of one million or more, and 75% of the population living in an urban area.
It's about 850 times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.0011 times 13,000.(2015 figures) (distinct Monarchs)
It's about 1,500 times the number of Symphonies Composed by Beethoven.
In other words, 13,000 is 1,444.444444440 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.00069230769231 times that amount.(a.k.a. Ludwig van Beethoven)